Reference counting stats do not account for immortal objects.

[markshannon]

Bug description:

The reference counting stats (for example) show stats for increfs and decrefs (both in the interpreter and in the rest of the executable).

One might assume that is the number of Py_INCREF and Py_DECREFs executed, but it is not. It is the number of Py_INCREF and Py_DECREF where the object in question is mortal. We should add stats for Py_INCREF and Py_DECREFs of immortal objects as well.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• GH-124284: Add stats for refcount operations on immortal objects #124288

[vstinner]

@markshannon: I suppose that this issue can now be closed since the change c87b0e4 was merged.